diff --git a/Source/WebCore/Modules/webauthn/AuthenticatorTransport.h b/Source/WebCore/Modules/webauthn/AuthenticatorTransport.h
index 44826d76b1af..c6d3ed26d6e5 100644
--- a/Source/WebCore/Modules/webauthn/AuthenticatorTransport.h
+++ b/Source/WebCore/Modules/webauthn/AuthenticatorTransport.h
@@ -41,24 +41,4 @@ enum class AuthenticatorTransport : uint8_t {
 
 } // namespace WebCore
 
-namespace WTF {
-
-template<typename> struct EnumTraits;
-template<typename E, E...> struct EnumValues;
-
-template<> struct EnumTraits<WebCore::AuthenticatorTransport> {
-    using values = EnumValues<
-        WebCore::AuthenticatorTransport,
-        WebCore::AuthenticatorTransport::Usb,
-        WebCore::AuthenticatorTransport::Nfc,
-        WebCore::AuthenticatorTransport::Ble,
-        WebCore::AuthenticatorTransport::Internal,
-        WebCore::AuthenticatorTransport::Cable,
-        WebCore::AuthenticatorTransport::Hybrid,
-        WebCore::AuthenticatorTransport::SmartCard
-    >;
-};
-
-} // namespace WTF
-
 #endif // ENABLE(WEB_AUTHN)
diff --git a/Source/WebKit/UIProcess/WebAuthentication/Cocoa/WebAuthenticatorCoordinatorProxy.mm b/Source/WebKit/UIProcess/WebAuthentication/Cocoa/WebAuthenticatorCoordinatorProxy.mm
index e790f733b4e4..ba0a8c039b86 100644
--- a/Source/WebKit/UIProcess/WebAuthentication/Cocoa/WebAuthenticatorCoordinatorProxy.mm
+++ b/Source/WebKit/UIProcess/WebAuthentication/Cocoa/WebAuthenticatorCoordinatorProxy.mm
@@ -29,6 +29,7 @@
 #import "config.h"
 #import "WebAuthenticatorCoordinatorProxy.h"
 
+#import "ArgumentCoders.h"
 #import "LocalService.h"
 #import "Logging.h"
 #import "PageClient.h"
@@ -48,7 +49,6 @@
 #import <WebCore/WebAuthenticationUtils.h>
 #import <wtf/BlockPtr.h>
 #import <wtf/CompletionHandler.h>
-#import <wtf/EnumTraits.h>
 #import <wtf/StdLibExtras.h>
 #import <wtf/cocoa/VectorCocoa.h>
 #import <wtf/text/Base64.h>